Class 7 Science Chapter 18 MCQ (Multiple Choice Questions) of Wastewater Story in English Medium updated for CBSE Session 2022-2023. All the questions are important and useful of terminal exams and class tests. MCQs are design in such a way it covers the entire chapter 18 of class 7 science. There are about 60 questions in all divided into 10 MCQ online tests.

Class 7 Science Chapter 18 MCQ for 2022-2023

Class: 7Science
Chapter: 18Wastewater Story
Contents: MCQ Online Quiz with answers

MCQ Tests with Answers for Class 7 Science Chapter 18


Consider the following statements and choose the incorrect one:

[A]. Clean water is a basic necessity of our life.
[B]. The wastewater may also contain pieces of human excreta.
[C]. Use water or waste water could not be reused after cleaning it.
[D]. The cleaning of water is a process of removing pollutants harmful substances from it.

Sewage is mainly a:

[A]. Liquid waste
[B]. Solid waste
[C]. Gaseous waste
[D]. Mixture of solid and gas

Which of the following is or are products of wastewater treatment?

[A]. Biogas
[B]. Sludge
[C]. Both biogas and sludge
[D]. Aerator

Open drain system is a breeding place for which of the following?

[A]. Flies
[B]. Mosquitoes
[C]. Organisms which cause disease
[D]. All the above

Read the following sentences carefully, and choose the incorrect one:

[A]. Use water is waste water which can be recycled.
[B]. Wastewater is treated in a sewage treatment plant.
[C]. By products of wastewater treatment are sludge and biogas.
[D]. Sewage is a liquid waste which causes water pollution.

Arpit appeared in class test but he confused to know the correct statement. Would you help him to know that?

[A]. Open drain system is a breeding ground for flies, mosquitoes and organisms which spread diseases.
[B]. Waste water is produced in houses, industries, agricultural fields and other human activities which is known as sewage.
[C]. When underground sewage system and refuse disposal system not possible, the low cost on site sanitation system may be adopted.
[D]. All the above.

Pick from the following one chemical which is used to disinfect water?

[A]. Chlorine
[B]. Washing soda
[C]. Silica
[D]. Coal

Which of the following statement is or are correct?

[A]. Water that is fit for use and safe for drinking is known as clean water.
[B]. The dissolved and suspended impurities present in water are called contaminants.
[C]. The gas that is produced by decomposition of sludge by the anaerobic bacteria is known as biogas.
[D]. All the above.

The system of a network of pipes used for taking away wastewater from homes or public buildings to the treatment plant is known as

[A]. Sewers
[B]. Sewerage
[C]. Transport system
[D]. Treatment plant

The full form of WWTP is:

[A]. World Wide Transport Programme
[B]. Waste Water Treatment Plant
[C]. World Workers’ Talent Programme
[D]. None of these.

Which is used in vermi processing toilets?

[A]. Cockroaches
[B]. Earthworms
[C]. Snail
[D]. Silkworms

In a filtration plant, water is filtered using layers of:

[A]. Sand and clay
[B]. Clay and fine gravel
[C]. Sand and fine gravel
[D]. Sand, fine gravel and medium gravel

Which of the following is a good practice be followed?

[A]. Cooking oil and paint should not be thrown down a drain.
[B]. Used tea leaves, solid food and cotton should not be thrown in the drain.
[C]. Chemicals like insecticides should not throw in the drain.
[D]. All of the above

Which of the following is not a source of wastewater?

[A]. Sewers
[B]. Homes
[C]. Industries
[D]. Hospitals

Which of the following statements about ozone are correct?

[A]. It is essential for breathing of living organisms and it is used to disinfect water.
[B]. It is used to disinfect water and it absorbs ultraviolet rays.
[C]. It is essential for breathing of living organisms and it absorbs ultraviolet rays.
[D]. It is used to disinfect water and its proportion in air is about 3%.

The General Assembly of United Nation on the World Water Day on 22nd march 2005 has declared the period as the international decade for action on:

[A]. Water for Life
[B]. Nature for Water
[C]. Water and Disaster
[D]. Water for Future

“By providing clean water and sanitation to the poorest people on the planet, we can reduce poverty and suffering and ensure education for all children.”— said by:

[A]. International Labour Organisation (ILO)
[B]. International Monetary Fund (IMF)
[C]. Food and Agricultural Organisation (FAO)
[D]. United Nations International Children’s Emergency Fund (UNICEF)

Which of the following organisms produce biogas from sludge in the digester tank of a wastewater treatment plant?

[A]. Anaerobic bacteria
[B]. Fungi
[C]. Aerobic bacteria
[D]. Protozoa

In this year board examination, Ajju were asked a question where he had to choose the statement which was/were correct? Will you be able to answer this question?

[A]. World Water Day 2020, on 22 March, is about water and climate change.
[B]. The theme of 2019 was about tackling the water crisis by addressing the reasons why so many people are being left behind
[C]. In 2017, the theme was “Why Waste Water?” which was about reducing and reusing wastewater.
[D]. All the above

Which of the following is not a water-borne disease?

[A]. Cholera
[B]. Tuberculosis
[C]. Typhoid
[D]. Dysentery

Recently, in a science class test, you are asked a question where you have to say whether the statements are correct or not?

[A]. Untreated human excreta is a health hazard.
[B]. The untreated human excreta cause soil pollution and water pollution.
[C]. More than one billion people in the world do not get safe drinking water.
[D]. None of the above

The examples of onsite sewage disposal system for human waste are:

[A]. Septic tanks
[B]. Composting pits and
[C]. Chemical toilets.
[D]. All the above

Vacuum toilets are usually used in:

[A]. Superfast trains
[B]. Cinema halls
[C]. Aeroplanes
[D]. Large ships

Consider the following statements and choose the correct one:

[A]. We should never urinate on the roadside.
[B]. We should not spit in public places.
[C]. After eating a banana, we should not throw banana peels on the road side.
[D]. All the above

Which of the following are used for the safe disposal of human excreta in those areas where sewerage system does not exist and water supply is limited or not available at all?

[A]. Chemical toilets
[B]. Vacuum toilets
[C]. Septic tank toilets
[D]. Composting toilets

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